Instant conversion
Kmh To mph Converter
1 km/h = 0.621371 mph. Multiply km/h by 0.621371.
0.3107 mph
Common km/h to mph conversions
| km/h | mph |
|---|---|
| 0.5 | 0.3107 |
| 1 | 0.6214 |
| 2 | 1.243 |
| 3 | 1.864 |
| 5 | 3.107 |
| 10 | 6.214 |
| 20 | 12.43 |
| 50 | 31.07 |
| 100 | 62.14 |
| 200 | 124.3 |
| 500 | 310.7 |
| 1000 | 621.4 |
How this conversion works
1 km/h = 0.621371 mph. Multiply km/h by 0.621371.
Privacy: Conversions run in this browser. Nothing you type is uploaded.
What you are converting
Kilometer per hour
A kilometer per hour is the speed of one kilometer in one hour. Real-world anchor: European highway limits are 90–130 km/h.
Mile per hour
A mile per hour is the speed of one mile in one hour. Real-world anchor: US highway limits are 55–80 mph.
Why convert and when you would use this
Reverse speed conversion for travelers and imported car speedometers.
Rounding and accuracy
Use 2–4 decimal places for everyday tasks; keep more for engineering or lab precision.
Frequently asked questions
How do you convert km/h to mph?
1 km/h = 0.621371 mph. Multiply km/h by 0.621371.
What is 1 km/h in mph?
1 km/h equals 0.621371 mph.
How do you convert back from mph to km/h?
Use the related mph to km/h page.